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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 41, Iss. 30 — Oct. 20, 2002
  • pp: 6325–6331

Propagation Characteristics of a Diffracted M2 Beam

Sho Amano and Takayasu Mochizuki  »View Author Affiliations


Applied Optics, Vol. 41, Issue 30, pp. 6325-6331 (2002)
http://dx.doi.org/10.1364/AO.41.006325


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Abstract

The propagation characteristics of a beam diffracted by a circular aperture are investigated. The beam-quality factor <i>M</i><sup>2</sup> defined by an 86.5% power-content radius is given theoretically and experimentally as a function of the truncation ratio. It is found that the theoretical limit of <i>M</i><sup>2</sup> is 2.37 times as great as that of an incident beam as the truncation ratio approaches 0. For a weakly diffracted beam a simple formula giving <i>M</i><sup>2</sup> is derived. Although <i>M</i><sup>2</sup> does not increase much with diffraction, the influence of diffraction should be taken into account in beam brightness.

© 2002 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(030.4070) Coherence and statistical optics : Modes
(050.1220) Diffraction and gratings : Apertures
(260.1960) Physical optics : Diffraction theory

Citation
Sho Amano and Takayasu Mochizuki, "Propagation Characteristics of a Diffracted M2 Beam," Appl. Opt. 41, 6325-6331 (2002)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-41-30-6325

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